Hi all,
I am working through the Bob Tait CNAV and Nav Workbook at the moment.
Something I am having trouble with is determining what the heading is when converting a magnetic direction to a compass direction.
Using the below compass card as an example:
°M

N

030

060

E

120

150

S

210

240

W

300

330

°C

000

028

058

090

122

152

182

212

241

271

301

330

I've looked through previous threads, and the general advice is use the conversion on the card which is closest to your magnetic heading; for example a heading of 219°M would most closely align with 210°M, therefore using the 210°M correction, the compass heading would correct to 221°C.
In the Nav workbook, Exercise: True, Magnetic and Compass Direction; this works for some conversions but not all (the questions where this does not work, the difference is 1°). Is the correct method to interpolate the data and come up with a more precise calculation? Am I missing something?
Thank you in advance,
Zac